Cutting tool unit for ground working implements



July 28, 1931. J. L. CHONG ET AL CUTTING TOOL UNIT FOR GROUND WORKING IMPLEMENTS Filed Sept. 29, 1930 INVENTOR-S due L. (720121},541129 L. ("h

01 9' and Look L. C1703? Q g Q ATTORNEY Patented July 28, 1931 -uN'iTED STATES PATENTIQFFICE JUE L. cHoNG. SAML. CHONG, AND LOOK L. cnoNe; or IsLnToN, cn FoRN A CUTTING "TOOL UNIT FOR GROUND WQRKTNG IMPLEMENTS 7 Application filed september 29, 1930.

This invention relates to ground working implements of the rotarytype and particularly to the cutting or digging tools, thereof, and the means to mount the tools in connection with the supporting standards. The present invention also particularly represents improvements over the structure for the same purpose shown in the patents of Miller and Leong, Nos. 1,699,151 and 1,699,152 dated January 15, 1929; and which patents are now Owned by us. I V

In the previous implement it was contemplated to make the blades removable from the standards in order to facilitate the resharp ening or replacing ofsaid blades, and to cut down the time and expense of such operations as much as possible; In the particular structure previously employed for thus removably mounting the blades, the locating rlvets were so arranged that their. heads quickly wore away,"allowing the blades to drop oit. This objectionable feature :was aided by the arran ement of the holdin or clam in means which maintained the blades snugly against the rivet heads rather-than against th supporting pads on the standards.

Also the blades were formed the sole support and holding means for the blades. Actual operation in the field iormwith its front and backedges straight with structures as above arranged soon showed up'these detects, and the main aim of the present invention is to eliminate the same. This is done by reversing the relative setting of the blades and standard pads, and the setting of the locating rivets relative thereto; and by arranging the holding means so that the blades are clamped against the standard pads rather than against the rivet heads.

A further object of the inventionis to produce a simple and inexpensive device and yet one which will be exceedingly ellectivew for the purpose for which it is designed.

These objects we accomplish by means of such structure and relative arrangement of parts as will fully appear following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views: 7 7

proved the direction of rotation of the structure. 7 Each pad forms the;supporttor a blade l disposed below or under said pads so that said-rivet heads ground by a perusal of the Serial No. 484,976.

Fig. 1 is a .tragmentaryside elevation of the standard supporting disc of a rotary implement, showing the mounting of our imtools in connection therewith.

Fig. 2 is a top plan view of a tool unit with the standard in section. a r

Fig. 3 is a plan view of a bladedetached.

.Fig. 4. ,is a perspective View partly broken away of a standard and its blade supporting pad. i 6.

Fig. 5 is a vertical section of a blade and pad showing the specialclampingscrew used to hold the blade against the pad.

Referring now more particularly to the characters of'reterence on the drawings the 5 numeral 1 denotes the tool supporting standards of the implement structurerigi dl rectangular bars adaptedvto bebolte'd ontola rotatable supporting disc 2 insuitablecin cumferentially spaced relation. Projecting 3 upwardly from the outer ards are rigidpads 8 which are disposed at an obtuse angle to the longitudinal planeof the post bothtransversely and lengthwise of andparallel-to each otheryand it is disposed so that its cutting edge lies atan acutetransverse angle to-the line of travel; the forward a 1 edge of" the "pad beingsimilarlyjangled 'so that it is parallel tofitl e ci' tting edge ottlie blade. 'I'he blade also hasan angular set.- ting in a horizontal transverse plane, on account of the" similar setting of the' support ing pad. The. blade therefore enters the t with a double shearing action and thustunctionsvery eliicie'ntly with a mini- 'mumot strain on the supporting structure and its operating; mechanism. A pair of -rivets 5 are secured in the pad in front of the f standard and'project inwardlytherefrom or away from the ground engaging surtacejof the same;-sa1d rivetsbeing disposed in parallel alinementto. lthe tront edge of the p ad N and being-spaced aparttransverselyj on the' en'dsot'the standpad substantially equal distances to the sides of the standard.

The heads of the rivets are spaced from the pad a suliicient distance to receive the blade thereunder; said blade being provided with slots 6 cut in from its back edge and of suficient width to engage the body of the rivets but incapable of receiving the rivet heads therethrough. The slots are cut as shown in Fig. 3 so that they extend length wise of the line of travel of the blade rather than being at right angles to its back ec ge. This enables the blade to be mounted or vithdrawn in a straight-line direction relative to the line of travel and prevents interference of any blade being thus manipulated with the blades of any adjacent transverse row of blades.

It may here be noted that the implement as a whole has a number of the discs 2, arranged in transversely spaced relation on a common shaft, with the standards of the different discs in circumferentially staggered relation to each other, similar to the arrangement in the above mentioned patents and for the same purpose. t is also to be noted that even though the blades are disposed at an angle to the disc abutting faces of the standards, a line extending across the blade from the standards and parallel to said faces, practically bisects the blades, as indicated in Fig. 2. This enables the discs to be set the same distance apart so that the holding bolts for the standards may be conveniently manipulated, and .without the blades of one disc interfering with those of the adjacent disc, or on the other hand being spaced too far from the same in a transverse direction.

Centrally between the rivets and in alinement therewith a special clamping screw '7 is mounted in the pad. A portion of this screw projects inwardly of the pad and is adapted to engage a properly positioned slot 8 cut from the back edge of the blade parallel to the slots 6.

The upper edge of the slot 8 is chamfered as at 9 to engage the bevel formed on the under side of the head 7a of the screw, as shown in Fig. 5. The outer end of this screw terminates inwardly of the ground bearing surface of the pad, so that it will not be worn away by contact with the ground and is provided at said end with a rectangular socket 10 to receive a turning tool of suitable character. By means of the above arrangement it will be seen that when the blade is in place on the pad, a turning of said screw in the proper direction will cause the blade to be firmly clamped against the pad and the rivet heads are of course relieved of all strain. 'l here is therefore no tendency in operation for the blades to pull off the rivet heads or to drop clear of the pads.

From the foregoing description it will be readily seen that we have produced such a de- 1. A tool unit for a rotar earth workin i b l implement comprising a standard adapted to be secured to a. rotating member, a pad at the outer end of the standard, transversely spaced members projecting from the inner face of the pad, a blade to rest on the inner face of the pad and having slots cut in from its back edge to engage said members whereby to locate the blade 011 the pad, and additional means to detachably engage the blade and clamp the same against the pad.

2. A structure as in claim 1, in which said additional means comprises a screw threaded into the pad, and projecting inwardly beyond the same, and a head on the inner end of the screw to engage the inner face of the blade; the latter having an additional slot cut in from the back edge of the blade to receive the body portion of the screw between the head thereof and the pad.

3. A structure as in claim 1, in which the back and front edges of the blade are parallel to each other, the slots are the same depth, and the headed members are disposed in a line lying at an acute transverse angle relative to the plane of rotation.

a. A structure as in claim 1, in which the head-ed members are disposed in a line lying at an acute transverse angle to the plane of rotation, while the blade slots are cut so as to extend parallel to such plane.

In testimony whereof we affix our signatures.

J UE L. CHONG. SAM L. GHONG. LOOK L. OHONG.

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